Being able to cast walls for military science would be nice. Landfill is less directly useful, but would also be neat. They’re both simple recipes, nothing but stone, so it would make sense for them to be completely castable. And foundation production would benefit a lot from the extra speed and productivity of the foundry. Vanilla foundation has one fluid ingredient (cold fluoro), and the foundry has two fluid inputs, so there is room for a molten stone input.
